JE LS2 Asymmetrical FSR Dish Top Forged Piston (J312025)

J312025 - LS2 4.005" FSR PISTONS -16.6cc

4.005" bore, 3.622" stroke, 6.125" rod length, -16.6cc dome volume

Part Number: J312025

Hands down, the best forged piston for your high performance LS engine! Our Asymmetrical FSR (Forged Side Relief) forging is engineered for today’s high power normally aspirated and forced induction LS engines. The exclusive asymmetrical skirt maintains a larger skirt area on the heavily stressed major thrust side, while reducing friction with a smaller skirt on the minor thrust side. The result is a high strength, lightweight piston that outperforms the competition! Note: For applications over 800hp, a thicker wall wrist pin is recommended.

Features:

Pin #927-2250-15-51C (106g) for use with 6.125 Rod Length
Round Wire Locks # 927-073-MW

Includes:

Accumulator Grooves
Double Pin Oilers
Offset Wrist Pin
Piston Specification:

Make: CHEVROLET
Engine: CHEVROLET LS GEN III/IV
Bore Diameter: 4.005
Compression Height: 1.304

Compression Ratio with 64cc chamber volume: 9.3

Compression Ratio with 68cc chamber volume: 9.0

Compression Ratio with 70cc chamber volume: 8.8

Piston Volume: -16.6

Cylinder Head: LS 12 DEG/15 DEG COMBO VR
Piston Pin Outside Diameter: 0.927
Piston Pin Length: 2.250
Piston Pin Material: 5115
Ringset Included: No
Top Compression Ring Thickness: 0.048
Second Compression Ring Thickness: 0.06
Oil Ring Thickness: 0.1175

Piston Material: 2618

Forging Type: FSR
Piston Avg Weight: 425

Pin Wall Thickness: 0.170
Piston Type: Dish